1440x900 resolution missing in Bootcamp (MBPr+Retina)

I just installed Windows 8 RP on my new MacBook Pro with Retina display and realized that the 1440x900 resolution option is completely missing from Windows (and games).

I've tried installed NVIDIA's latest 650M beta drivers (304.79), but they refuse to install. The frustrating thing about this is that 1440x900 is the most natural resolution for many games on the Retina display (since 2880x1800 either runs poorly, or reduces the UI of many games to unreadably small sizes). Intermediary resolutions cause ugly blurry jagged edges due to scaling.

Any ideas?